18885666539 has 2 divisors, whose sum is σ = 18885666540. Its totient is φ = 18885666538.

The previous prime is 18885666529. The next prime is 18885666557. The reversal of 18885666539 is 93566658881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18885666539 - 2¹² = 18885662443 is a prime.

It is not a weakly prime, because it can be changed into another prime (18885666509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9442833269 + 9442833270.

It is an arithmetic number, because the mean of its divisors is an integer number (9442833270).

Almost surely, 2^18885666539 is an apocalyptic number.

18885666539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18885666539 is an equidigital number, since it uses as much as digits as its factorization.

18885666539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74649600, while the sum is 65.

The spelling of 18885666539 in words is "eighteen billion, eight hundred eighty-five million, six hundred sixty-six thousand, five hundred thirty-nine".